The total number of calories each person needs per day will vary and depend on many factors such as age, gender and level of physical activity, etc. When you need to gain, lose or maintain weight... it will affect the amount of calories you need to consume. Estimates of the number of calories needed to maintain calorie balance at different ages and gender groups at three different levels of physical activity are provided in the following article.

If overweight and obese children are not intervened early, most of them will continue this condition into adulthood. This is a risk factor that increases the likelihood of children developing many chronic diseases, including diabetes, high blood pressure and sleep apnea. Therefore, a reasonable diet is an important factor for overweight and obese children to ensure their health.